Rotary bit



Dec. 31, 1940.

w. J. BEAVEN ROTARY BIT I Filed Oct. 14, 1959 2 Sheets-Sheet 1 7/- r 7/ J- l i I 4 l 75 7 20 I 5 3 J 5 x 5 V4 /3 v /6 5 -47 Wellieaz'em IN V EN TOR.

A TTORNEYS.

; Dec. 31, 1940. 2

Filed Oct. 14, 1939 w. J. BEAV EN ROTARY. BIT

2 Sheets-Sheet 2 W eIBdZ'QIZ IN VEN TOR.

ATTORNEYS.

Patented Dec. 31, 1940 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to rotary bits designed primarily for use in drilling walls.

One of the objects of the invention is to provide a bit having a removable blade which can be readily placed in and removed from position, simple and efficient means being provided whereby this blade will be held securely in place so as to prevent loss thereof while in use.

With the foregoing and other objects in View which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings Figure 1 is a side elevation of a bit embodying the present improvements, the lower end of the drill stem to which it is connected being shown in section.

Figure 2 is a vertical transverse section through the structure shown in Figure 1.

Figure 3 is an elevation of the blade and of the adjacent portion of that member of the blade holder on which the blade is mounted.

Figure 4 is a section through the bit taken on the line 44, Figure 3.

Figure 5 is a section through the complete bit taken on the line 55, Figure 3.

Figure 6 is an elevation of the lower end of the bit.

Figure 7 is a view partly in side elevation and partly in section of the lower portion of the blade holder and showing the plugs therein.

Referring to the figures by characters of reference, I and 2 designate opposed members cooperating to form a substantially cylindrical holder having a threaded reduced portion or neck 3 and a tapered threaded nipple 4, there being a central bore 5 extending into the holder through nipple 4 and into neck 3, this bore opening into vent passages 6 which diverge from the bore and are positioned within the respective members of the holder. These passages open downwardly through the lower ends of the members as shown at I and 50 are used for the purpose of directing jets of water downwardly from the bore 5.

Each of the members I and 2 has a flat inner side indicated at 'I' and the lower portion of each flat side or face is recessed transversely as at 8 so that the distance between the opposed faces of upper wall of the recess in member I and from 1 0" the lower edge of face 8. Boss ID is preferably oblong but it is to be understood that it can. be of any other desired configuration. However it is preferably angular. The thickness of the boss is substantially equal to that of the blade to be 15 hereinafter described and extending from. the boss is a stud I2, preferably round, adapted to be seated within a similarly shaped re'cess I3 formed in the flat face 8 of the member 2.

The blade used in connection with the holder is 20 formed of a plate I4 the thickness of which is substantially equal to the distance between the flat faces 8 andthis blade is provided with an angular opening I5 so located that when the plate is seated within the recessed portions of the mem- 25 here I and 2 and against shoulder II, the boss It will fit snugly within the opening I5 and will have its surface substantially flush with the corresponding face of the blade. This will be apparent by referring, for example, to Figure 5. 30 Oppositely extending ribs I6 are preferably provided along the side edges of the blade and are located where they will lap and bear against the flat side faces 9, thereby to supplement boss I0 in holding the blade properly alined with the holder 5 while in use. The blade is extended beyond the lower ends of the members I and 2 and the projecting portions thereof are oppositely pitched and sharpened so as to form opposed cutting elements as indicated at H.

After the blade I4 has been assembled with member I the member 2 is applied thereto and the stud I2 will enter recess I3. Dowel-pins I8 are seated in recesses I9 in the meeting faces I of the members for the purpose of facilitating 45 assemblage of the parts and after the blade and the two members have been brought together as shown in Figure 5, a collar 20 is screwed onto the neck portion 3 of the bit, thereby. operating to hold the members together securely and cause them to clamp firmly upon the interposed blade.

After the collar or jamb nut 20 has been placed in position, a sub-box or coupling 2| is screwe onto the split nipple 4 and to the upper tapered nipple or end 22 of the sub-box is screwed the lower end of the tubular drill stem 23 which opens downwardly through the sub-box 2| and into the bore 5.

After the parts have been assembled as described, wooden plugs 24 having heads or enlargements 25 at their lower ends, are inserted upwardly into the passages 6 and, if desired, can be retained therein by spring wires 26 pressing outwardly against the walls of the passages. These plugs serve to prevent mud or other foreign substances from packing into the passages 6 while the bit is being lowered into a well. As soon as water under pressure is directed into the stem 23 it will blow out the plugs 24 thereby to permit the water to escape in jets for use as ordinarily.

The bit is used like any other rotary bit of the blade type and has been found extremely serviceable and practical. It is advantageous because of the ease with which the blade can be replaced.

The bit herein described can be used with any standard type of well equipment, is formed of few parts, and, obviously, will not readily get out of order.

What is claimed is:.

1. A rotary bit including a blade having opposed ribs at the side edges thereof and oppositely pitched cutting portions at one end, there being an aperture in the blade, opposed holding members engaging opposed faces of the blade and seated between and against the ribs, a boss on one of the members seated in the aperture in the blade and flush with the faces of the blade, a stud on the boss housed in the other member, and a nut surrounding the members and holding them detachably assembled with the blade.

2. A rotary bit including a blade having opposed ribs at the side edges thereof and oppositely pitched cutting portions at its lower end, there being an aperture in the blade, opposed holding members engaging opposed faces and the top and. side edges of the blade and seated between and against the ribs, a boss on one of the members seated in the aperture in the blade and flush with the faces of the blade, a stud on the boss snugly housed in the other member, a nut surrounding the members and holding them detachably assembled with the blade, there being a bore extending longitudinally between the members and having outlet passages opening through the respective members, and tubular means for coupling said members to a tubular stem.

3. A rotary bit comprising opposed holding members cooperating to provide a blade-receiving recess having a shoulder at one end, a blade removably seated in the recess and against the shoulder, said blade having an aperture, a boss extending from one of the members for fitting snugly within the aperture and flush with the faces of the blade, thereby to hold the blade against withdrawal from the recess, a stud on the boss housed in one of the members, and means engaging the members to hold them assembled with the blade.

WILLIAM J. BEAVEN. 

